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Marine Forecasts
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National Weather Service Marine Forecasts

Marine Forecast Offices and Centers Marine Forecast Offices & Centers provide links to their products as well as additional regionally focused information. Click on map for links.

Beware of hypothermia during these cooler months. Did you know your body can cool 25 times faster in water than in air? That water does not need to be very cold to endanger you?

What is a "Marine Zone Forecast"?
What is a "Marine Point Forecast"?

How can I get a marine forecast via zip, city, or lat/lon?

Did you know that the height of some individual waves may be twice the height of the forecast seas? And may present an even greater danger near shore or any shallow waters?


Space Weather Impacts to Mariners


Don't throw away that sextant just on


From the National Geospatial-Intelligence Agency's (NGA), Notices to Mariners, Special Paragraphs:


There is a growing potential that space weather events including geomagnetic and solar radiation storms will adversely impact mariners around the peak of the 11-year sunspot cycle in 2013. Such events can disrupt satellite communication and navigation systems including Inmarsat and GPS, HF radio, and very occasionally VHF radio. There is also the potential that these systems can be interrupted indirectly as terrestrial networks and power systems can be affected as well. Conversely, some HF communications can improve, usually for those frequencies above 15 MHz. The impacts will usually be greater at higher latitudes. The northern lights are a phenomenon related to space weather. For an introduction to space weather activity, see NOAA's Space Weather Prediction Center's (SWPC) primer at Notice of these and other events may be issued on an experimental basis within NOAA marine weather forecasts at a frequency intended to minimize the number of false alerts. Mariners should keep in mind that the state of science is such that neither these events nor the actual impacts can be forecast with certainty. For further information on space weather see"

The UK Maritime and Coastguard Agency's Marine Information Note "Navigation: Global Navigation Satellite Systems (GNSS) - Availability During Increased Sunspot Activity" contains some very helpful information of value to mariners

A handy reference containing propagation charts to get some idea on how sunspots are impacting HF radio communication is available courtesy of the American Radio Relay League (ARRL).


Sampling of data available from NOAA's Space Weather Prediction Center:


NOAA Scales Activity

Range 1 (minor) to 5 (extreme)
NOAA Scale
Geomagnetic Storms
Solar Radiation Storms
Radio Blackouts


National Weather Service
Analyze, Forecast, and Support Office
Marine, Tropical, and Tsunami Services Branch (W/AFS26)
Last modified: Dec 14, 2014
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